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FSBO at 97% of the agent-achievable price nets $424,288 vs the agent's $427,500 — you must beat 97.7% of the pro's price just to tie. The saved half-commission is the whole prize.
FSBO math is usually run as "save 5%": wrong. You still pay the buyer's agent (2.5–3% — refusing shrinks the buyer pool), still need MLS exposure ($300–1,000 flat fee), and still need an attorney for contract and disclosures ($500–1,500). The decision is the price-achievement gap: academic estimates put FSBO sales 0–5% below agent-achieved prices, confounded but real. At the defaults — $450,000 agent-achievable, FSBO at 97% — the agent nets $427,500 and FSBO nets $424,288: the pro wins by $3,213, and FSBO must achieve 97.7% of the agent's price just to tie. FSBO wins when you already know the buyer or the comp set prices the home for you; this calculator shows exactly where your line is.
Sellers use it before skipping the agent: FSBO at 97% of the agent-achievable price nets $424,288 vs the pro's $427,500 — you must beat 97.7% of their price just to tie, and disclosure liability is yours either way.
Around the edges — the core math survived. What changed: buyer-agent commissions are no longer advertised on the MLS, buyers increasingly sign agreements to pay their own agent, and everything is more negotiable in print. What did not change: in practice most sellers still offer buyer-agent compensation (2–3%), because not offering it shrinks the buyer pool — buyer agents steer, and unrepresented buyers often ask for the equivalent concession anyway. For FSBO sellers the settlement cuts both ways: you can now legally refuse buyer-agent compensation more cleanly, but the buyers who come unrepresented expect the savings shared, and the ones with agents need their fee from somewhere — it lands back in your net either way. The durable advice: price the buyer-agent fee into your FSBO net (this calculator does), put any offered compensation in writing, and treat "commissions are negotiable now" as an invitation to negotiate the listing side hard — 4% versus 5% on $450,000 is $4,500, a bigger lever than most FSBO decisions.
Four profiles, all sharing one trait: the price-achievement gap is near zero. The known-buyer sale — neighbor, tenant, coworker — where marketing adds nothing; just hire the attorney and save both commission sides you can. The self-pricing home: a tract house with six identical recent comps where pricing is arithmetic and the buyer pool refreshes weekly — flat-fee MLS plus a transaction coordinator captures most of the agent value at $1,500. The experienced seller: ex-agents, investors, attorneys — people for whom the paperwork is Tuesday. And hot-market sellers with patience: when everything sells, the agent's marketing edge compresses — though note the same hot market means agents create bidding wars that exceed the list price, which is price achievement too. Where FSBO reliably loses: unique or luxury homes (pricing is art, buyer pool thin), slow markets (marketing IS the product), emotional sellers (negotiation leaks money), and anyone whose alternative use of 60–100 hours has value. The time ledger belongs in this decision: pricing research, photography coordination, showing management, negotiation, inspection defense, appraisal defense, and closing herding is a part-time job for 2–4 months.
Disclosure law is where unrepresented sellers get sued, and it outlives the closing. Every state mandates seller disclosures — known defects, water history, roof age, lead paint (pre-1978 federal), deaths on the property in some states, HOA status — and "I didn't know I had to mention it" is not a defense; the buyer's attorney finds the undisclosed foundation repair permit years later. The protections: hire a real-estate attorney or transaction coordinator for the paperwork even in a pure FSBO ($500–1,500, the cheapest liability insurance in the deal), disclose MORE than required (over-disclosure has never lost a lawsuit), keep every receipt and permit, and get a pre-listing inspection ($400–500) — it converts surprises into disclosed-and-priced items before a buyer's inspector weaponizes them. The other traps: fair-housing law (what you say in a showing can be illegal discrimination — "perfect for a young family" is a claim), purchase-contract contingencies you mishandle (earnest-money disputes), and wire fraud (FSBO sellers are prime targets — verify every wiring instruction by phone at a known number). None of this is a reason not to FSBO; it is the job description the agent's commission was quietly covering.